Computer System Reconnaissance Via Wmic.EXE

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: Nasreddine Bencherchali (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects execution of wmic utility with the "computersystem" flag in order to obtain information about the machine such as the domain, username, model, etc.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1047` Windows Management Instrumentation

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: Computer System Reconnaissance Via Wmic.EXE
id: 9d7ca793-f6bd-471c-8d0f-11e68b2f0d2f
status: test
description: Detects execution of wmic utility with the "computersystem" flag in order to obtain information about the machine such as the domain, username, model, etc.
references:
    - https://www.microsoft.com/security/blog/2022/09/07/profiling-dev-0270-phosphorus-ransomware-operations/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-08
modified: 2023-02-14
tags:
    - attack.discovery
    - attack.execution
    - attack.t1047
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Image|endswith: '\wmic.exe'
        - OriginalFileName: 'wmic.exe'
    selection_cli:
        CommandLine|contains: 'computersystem'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_wmic_recon_computersystem/info.yml

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_img`

selection_img:
    - Image|endswith: '\wmic.exe'
    - OriginalFileName: 'wmic.exe'

Stage 2: `selection_cli`

selection_cli:
    CommandLine|contains: 'computersystem'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`computersystem`	`field:"CommandLine" kind:match value:"computersystem"`
`Image`	ends_with	`\wmic.exe` corpus 62 (sigma 62)	`field:"Image" kind:ends_with value:"\wmic.exe"`
`OriginalFileName`	eq	`wmic.exe` corpus 80 (sigma 38, elastic 24, splunk 18)	`field:"OriginalFileName" kind:eq value:"wmic.exe"`